It has been said that the brightness setting for the SPC900 camera affects only what appears on the screen and not what appears in the capture file. Having read the code for the Linux SPC900 driver I wasn’t at all convinced of this and so created three images from captures from the camera at minimum (0), mid (63) and maximum settings (127) in SharCap. Here are the results:
I think it’s quite clear from those that the brightness setting does indeed affect what appears in the capture file. The question that now springs to mind is “What is the best brightness setting?”. I’ve no idea about that, so I leave my brightness control at the mid-point of the range.